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- W2171513529 abstract "1 . Introduction In a previous paper [2] the senior authors proved the following theorem: Let G, = GI (n ;cn 2 ) be a graph of n vertices and cn 2 edges, c a positive constant . Then for n sufficiently large there is always a subgraph G 2 = G2 (m ;f(c)n 2 ) of G, every two edges of which lie together on a cycle of length at most. 6 in G 2 , and if two edges of G 2 have a common vertex they are on a cycle of length 4 in G 2 . In that paper, we did not determine f(c) explicitly although the arguments used would yield something of the form f(c) _ 01c 3 . Here we replace c by n-e for e small and to some extent determine f(n ') . That is, we consider G 1 = G 21 (n ;n £ ) and try to find the subgraph G 2 having the largest number of edges with each pair of these edges on a short cycle . This problem leads to surprising and perhaps unexpected complications . Ode remark that in our previous paper we also discussed hypergraphs . In this paper, we do not do this but hope to return to that problem in the future (for the SENIOR author of course there may not be a future) . Here we prove the following theorem : For sufficiently large n each G 1 = G 1 (n ;n2-L ) contains a G 2 = G 2 (m ;cn2-3c ), where c does not depend on m, n, or c, in which every two edges are on a cycle of length at most 6 in G 2 , and that apart from the value of c this result is the best possible, i .e ., 3e cannot be replaced by any smaller value . If we further insist that any two edges of G 2 which have a common vertex are on a cycle of length 4 in G 2 then we can only show that there exists a G 2 = G 2 (m,cn 2-5c ), but here we do not know if 5c is best possible, and we cannot exclude the" @default.
- W2171513529 created "2016-06-24" @default.
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- W2171513529 date "1984-01-01" @default.
- W2171513529 modified "2023-10-16" @default.
- W2171513529 title "MORE RESULTS ON SUBGRAPHS WITH MANY SHORT CYCLES" @default.
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